Needle-syringe barrel attachment



Dec. 18, 1962 M. J. coHEN NEEDLE-SYRINGE BARREL ATTACHMENT Filed OC'h. l, 1958 Illu INVENTOR MILTON J. COHEN ATTORNEY United States Paent Filed Oct. 1, 1958, Ser. No. 7643559 3 Claims. (Cl. 12S-221) This invention relates to the treatment of human ills and to the equipment employed and more particularly to the facilities used in the combination and injection of medicines into the human body for the treatment of certain symptoms and conditions.

The invention is directed specifically to hypodermic syringes by means of which injections of medicaments in solution can be made and to the construction of such syringes including the manner in which the needles are fastened in and to the barrel of the syringe.

Heretofore hypodermic syringes have been complicated and expensive due among other things to the manner of fastening the needles to the barrel and it has not been possible to produce a disposable hypodermic syringe at low cost or a reasonable price. l It is an object of the invention to produce a satisfactory disposable hypodermic syringe at a cost and reasonable price substantially below prior costs, and to provide a method of manufacturing such disposable hypodermic syringes.

Another object of the invention is to simplify and improve .the joint of a hypoderinic needle to the. barrel or vial' or a hypodermic syringe both as to structure and process and regardless of theV shape of the barrel Whether of uniform shape, `or'enlar'ged or constricted at the open end in which the needle is applied. Y

-Another object of the invention is to provide a disposablehypodermic syringe/at low costand in whichV a needle in the formof a straight' piece of needle tubing is fastened within the end of a barrel or vial Without the use of a hub as well as the method by which such is accomplished thereby overcoming the major problem of the cost of producing disposable hypodermic syringes.

Other objects and advantages of the invention will be apparent from the following description taken in conjunction with the accompanying drawing wherein:

FIG. 1 is a perspective of the disposable hypodermic syringe embodying one application of the invention;

FIG. 2, an enlarged fragmentary section on the line 2 2 of FIG. 1;

FIG. 3, an enlarged fragmentary perspective of a modified form of the invention with portions cut away to reveal the interior; and

FIG. 4, an enlarged fragmentary perspective of a modified form of the invention with portions cut away to reveal the interior, and

FIG. 5', a fragmentary section similar to FIG. 2, illustrating a modified form of the invention.

Brieiiy stated, the invention is a disposable hypodermic syringe made possible by the simplification and improvement in the manner of attaching the needle in the end of the barrel or vial regardless of the conguration thereof, Whether straight, slightly constricted or provided with a neck. The needle is firmly anchored in a permanent manner within the end of the barrel or vial and which incidentally may be of glass, plastic or other preferred material. The fastening of the needle in place is accomplished by placing the needle in the proper position adjacent to the end of the barrel, filling the intervening space and then causing the lling material to harden. The invention contemplates the use of a monomer as the filling material to which a polymer is added to cause the material to harden.

In the production of a disposable hypodermic syringe 3,058,866 Patented Dec. 18, 1962 at low cost and in which the needle is fixed in the end ICC of a cylindrical barrel or vial, a barrel or container 10 for medicament in solution may have a flange 11 on one end for engagement by the middle and forefinger while the thumb is engaging the head 12 of a piston 13 of a diameter to fit snugly within the barrel and by means of which theicontents of the barrel may be discharged from the other end through a hollow needle 14 for which there is a protective cap 15 for covering the needle until the hypodermic is to be used whereupon the cap can be removed.

The needle 14 may be composed of a straight piece of needle tubing and in the fastening of the same in the end of the barrel it is Vfirst placed centrally in axial position Within the end of the barrel. This may be done by mounting the vneedle in a plug 16 of flexible material such as rubber which may have one or more annular ribs 17 which engage the interior of the barrel 10. Such plug may have a recess 17 as illustrated in FIGS. 2, 3 and 4 or it may have a flat surface as shown in FIG. 5.

In order to fasten the needle 14 supported axially by ,the plug 16 firmly within the end of the barrel 10, a filler is employed which may be in the form of a powderto which a liquid is added to cause fusion with the barrel .10,- the needle 14 and the plug 16. In fastening the parts together, the filler may have'components of liquid and powder or of a monomer and a polymer; however, the invention is not limited thereto-but is intended to include any combination of substances which provide a filler or ,mass which will -hardenv and securely and firmly unite parts of the device. It is contemplated that an inert plasltic be used although metallic "plastic is contemplated -as -in powder metallurgy including aluminum or iron or-any other plastic or moldablel substance Vadapted to harden on exposure to air or temperature change or other external v stimulant for effecting the desired result.

The mounting of the needle in the barrel or container for the medicament in the manner indicated is possible regardless of the type of open end in which the needle is mounted whether straight, flared or constricted and if constricted, regardless of the degree of constriction.

A straight barrel 1t) is illustrated in FIGS. l and 2 and constricted barrels 10 and 10 are illustrated in FIGS. 3 and 4 respectively, the barrel 10 of FIG. 3 having an annular constriction 19 and the barrel 10" of FIG. 4 having a greater constriction in the form of a neck 20. In

the structure of each of FIGS. 2, 3 and 4 the needle 14 is mounted in a plug 16 having ribs 17 which engage the interior of the cylinder and a recess 17. A filler 18 or the like is employed to fill the recess 17' and the cavity between the plug and the end of the barrel, the filler conforming to the contour of the cavity in which it is located. The filler solidly fuses together or unites the needle, the plug and the barrel. The barrel may be of glass, plastic or other appropriate material without the use of a hub making it possible to employ a straight piece of needle tubing materially reducing the cost of the assembly which is an expensive component of a disposable hypodermic syringe. The structure of FIG. 5 is similar to FIG. 2 except that the plug 16 is not provided with a recess 17.

In the production of the device the needle may be pushed through an ordinary rubber plug such as that used in dental cartridges. In this way the plug holds the needle in axial or straight line position whereupon the plug and needle are inserted into the end of the barrel and where the end of the barrel is constricted the insertion of the plug will be from the rear with the needle forward and the plug will be pushed along the barrel until it is in contact with the constriction. The plug adds stability in'holding and centering the needle which projects from the end of the barrel. Y Y

As indicated 4theiiller may be composed of plastic, powder or liquid or a monomer and a polymer or other substances capable yof fusing or uniting the needle, the plug and the barrel, the ller being applied in the space in the lbarrel in front of the plug around the base of the needle.

Where a powder is employed it may be introduced in any desired manner as, for example, by means of a discharge'nozzleV and an appropriate amount of liquid or catalyst added -to act upon the powder Vand to form therewith aY plastic mass which, upon being allowed to stand for a relatively short time, will-solidify around the needle, and fasten it in permanent positionrin the end of the barrel so that when pressure is appliedin introducing the needle in the tissue, it will remain within the end of the Vbarrel and not move relative to the barrel. Y

I-t will be apparent from the foregoing that by the pres- Vent invention a satisfactory, simple and inexpensive hypodermic syringe'is provided in which the needle is adequately fastened within the Vend of the barrel and the syringe is-of suiciently low cost that it may be used once Y and discarded. Y Y

It will 'be' obvious to those skilled in the art lthat vari- 'ous' changes may be made vin the invention without departing from the spirit and scope thereof and therefore the invention is not limited 'by that which is illustrated in the drawing and described in the specification, but only as Vindicated in the accompanying claims. Y Y What is claimed is: "1. A disposable hypodermic syringe comprising a barrel in which -a solution containing a medicament is adapted to be contained, a needle through which the solution isY acrossthe full width Vof said barrel to prevent passage of medicament therebe'yond, said 'plug snugly kengagingthe inner wall 'surface thereof Vat a point spaced from the 4 extremity of said barrel `to provide a filler receiving cavity and being provided with a centrally located bore within which the inner end of said needle is received, the outer surface of said plug being provided with a centrally 1ocated recess surrounding said needle, said recess including an enlarged innerV peripheral portion, and a iiller hardened in situ in said cavity, said filler surrounding said needle and extending into the recess in said plug whereby said plugs and needle are firmly united to each other and to the surrounding barrel wall.

V2. LA disposable hypodermic syringe comprising a hollow substantially cylindrical barrel, aneedle attached to one end of s'aid barrel, a resilient plug .for holding said the axis thereof, said plug being spaced from the extremity 'Y of said barrel and providing a cavity for the'reception of a filler, said plug having a central recess adjacent to the cavity, and a ller filling said cavity and recess and surrounding said needle to fuse said barrel, plug and needle into an integral mass.

3. The structure of claim 2 in which said filler comprises a monomer in powdered form applied to said cavity and recess and a liquid polymer catalyst whereby the ller will form a permanent bond to fuse the barrel, plug and needle into an integral mass.

References Cited in the tile of this patent France Feb. 24, '1958 

